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LEAD RIBBON FOR METALLIC SEALS. 7 No. 293,600.v Patented Feb. 12, 1884.

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I! Z c ELISHA O. SLOAN, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO JOSEPH H.

OHADWIOK, AGENT, OF SAME PLACE.

LEAD RIBBON FOR METALLiO SEALS.

SPECIFICATION forming part of Letters Patent No. 293,600, dated February 12, 1884.

Application filed August 6, 1883.

T aZZ whom it may concern Be it known that I, ELISHA C. SLOAN, of Boston, in the county of Suffolk and State of Massachusetts, a citizen of the United States, have invented a certain new and useful- Improvement in Lead Ribbon for Metallic Seals, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.

Metallic seals for commercial use havehitherto been made of lead by casting in molds, the wires being subsequently inserted, and the seal impressed by die-nippers. This invention relates to a method of preparing them without the waste of casting; and it consists in a pressed lead ribbon of peculiar construction made in great lengths, to be cut up as desired, and in the die through which it is pressed. Lead, as is well known, welds un der pressure and heat, and this property is taken advantage of in this process. The sealribbon is made in the lead pipe machine, and the die for forming it may be at the top of the cylinder holding the molten lead, or at the bottom. or the lead on the die. These two situations of the die and these two movements of the lead are usual in the art of making lead pipe. 0 In the drawings, Figure 1 is a vertical sec-. tion of the die and its bridge-plate through the long axis of the ribbon on line 00 00, Fig. 3. Fig. 2 is a transverse vertical section of the die and its bridge-plate on. line y 1 Fig. 3 is a plan of the die next its bridge-plate. Fig. 4 is a plan of the bridge-plate next the die. Fig. 5 is aperspective of the seal-ribbon. Fig. 6 is a seal made from short length of the rib bon.

A is the die-block. I It has a slot, a, through it enlarged on the surface nearest the molten lead into a sort of basin, 6, as seen in Figs. 1. and 2 in section and in Fig. 3 in plan.

Bis the bridge-plate. Two holes, 12, lead 5 through it, entering the basin at b b of Fig. 3. Between these holes at c c are two conical The die may be forced on the lead (No model.)

spurs which enter the cavity a of the dieblock, leaving a little room toward the walls of the slot a. On applying pressure to the molten lead in the cylinder, from which the passages in the die and bridge are the only outlet, the metal flows through the holes b 1) into the basin a and around the spurs c and through the slot a, emerging from the die as a ribbon of indefinite length, as shown in Fig. 5 5

5. This ribbon has lead walls D and longitudinal cavities e c. It is preferably corrugated on its exterior, as at d d, to furnish on the surface lead enough to fill the cavities e 6 when stamped. It is out up to lengths by a saw and wired.

I do not claim the corrugations, forthey are old and may be dispensed with; nor do I claim the flowing of molten lead undera bridge and round the posts supporting it to form a pipe.

It is obvious that thebasin a may be in the bridge-plate as well as in the die, or the plate may be cut away, so as to leave a mere arched support for the spurs c c, in which case the basin a would be under the bridge. Of course pewter or other soft metal of low melting point, which welds in the same way, is the equivalent of lead in this manufacture.

I claim as my invention 1. As a new article of manufacture, a continuous lead seal-ribbon pressed hot through a die, substantially such as described, perforated throughout its length atee, substantially as and for the purpose described.

2. In a machine for forminglead ribbon forte W metallicseals, perforated throughout its length with cavities for wires for attaching said seals, the combination, with the die A and bridge B, provided with the slot to and basin a, of the conical spurs c, for forming the longitudinal perforations of the ribbon, substantially as described.

ELISHA' O. SLOAN.

Witnesses:

ROBERT BAMPTON, J r. GEORGE R. TOLMAN. 

